Avago Technologies LSI53C120 - Manual (Page 21)

LSI20101/LSI20102 SCSI Bus Boards 13
4.2 Physical Characteristics
The dimensions of the LSI20102 Extender board are 3.95 x 4.50 inches.
Power connection is made through connector J1. SCSI connection is
made through high density connectors J2 and J3. Board-mounted LEDs
or an offboard LED connected to J4 can be used to display SCSI bus
activity and TERMPWR status. Switch pack U4 is a combination of
external switches connected to J4 control termination. The component
height on the top of the board is not greater than 0.5 inches.
4.3 Board Mounting
The LSI20102 Converter board is mounted in an enclosure or computer
cabinet. The LSI20102 mounting holes are 0.125 inch in diameter. They
are located 2.55 x 3.75 inches apart in relation to the 3.95 x 4.50 inch
size of the board. (See
Figure 3 .)
4.4 Board Connectors
There are four connectors on the LSI20102 board:
•
Power Connector J1
•
SCSI Connectors J2 and J3
•
LED and SCSI terminator signals J4
4.4.1 Power Connector J1
The DC power interface is receives a standard disk drive power plug.
There is a fuse between the + 5 V connector and the SCSI bus
TERMPWR connectors. See
Table 7 for J1 signal assignments.
Table 7 Power Connector J1
J1-Pin Number Signal Name
1 Open
2 GND
3 GND
4 +5 V